 The metal screws which are used for large presses, vices, &c. have generally a square thread, a form which gives great steadiness of motion. A thread of which the sides are parallel, and the top and bottom a little rounded, is perhaps the most perfect...  Mechanics for Practical Men - Page 143by Alexander Jamieson - 1845 - 238 pagesFull view - About this book
 | William Emerson - Centrifugal force - 1769 - 170 pages
...futtain it. .- In the common fcrew, fuch as is here fuppofed j the threads are all one continued fpiral from one end to the other ; but where there are two or more Ipirals, independent of one another, as in the worm .of a jack •, you muft meafure between thread... | |
 | William Emerson - Mathematics - 1769 - 370 pages
...fuftain it. In the common fcrew, fuch as is here fuppoled ; the threads are all one continued fpiral from one end to the other ; but where there are two or more fpirals, independent of one another, as in the worm of a jack ; you muft meafure between thread and... | |
 | William Emerson - Centrifugal force - 1793 - 386 pages
...fuftain it. In the common fcrew, fuch as is here fuppofed ; ' the threads are all one continued fpiral from one end to the other; but where there are two or more fpirals, independent of one anorher, as in the worm of a jack ; you muft meafure between thread and... | |
 | George Adams - Science - 1794 - 540 pages
...fuftain it. In the common fcrew, fuch as is here fuppofed, the threads are all one continued fpiral( from one end to the other; but where there are two or more fpirals, independent of one another, as in the worm of a jack, sou mult meafurc bctweea thread and... | |
 | Alexander Jamieson - Industrial arts - 1829 - 654 pages
...made. The metal screws which are used for large presses, vices, &c. have generally a square thread, a form which gives great steadiness of motion. A thread...end to the other ; but where there are two or more serate spirals running up together, as in the worm of a jack, or the principal screw of a common printing... | |
 | James Smith (author of the Panorama of science and art.) - Industrial arts - 1859 - 964 pages
...thread, a form which gives great steadiness of motion. Athread, of which the sides are parallel, and tne top and bottom a little rounded, is perhaps the most...end to the other; but where there are two' or more sepurute spirals running up together, as in the worm of a jack, or the principal screw of a common... | |
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